The ARES M14 Back Tap Thread Repair Tool, No. 10111, features a compact design with an overall length of 4-3/4”. With a knurled thumb nut that offers a sturdy grip to reduce slippage while in use, its collapsible back-tap design repairs threads from the inside out, preventing metal shavings from entering the combustion chamber. The M14 x 1.25mm Back Tap Thread Repair Tool is made of premium heat-treated chrome moly steel with a corrosion-resistant zinc plating finish. It is also ideal for O2 sensor bungs and small engine applications that utilize M14 spark plugs. Also available in M12 x 1.25mm thread spec (No. 10110).